Shedding light on dark DNA Most textbook definitions of evolution state that it occurs in two stages: mutation followed by natural selection. DNA mutation is a common and continuous process, and occurs completely at random.
The average adult only eats 15 grams of fiber per day. Women need 25 grams of fiber per day, and men need 38 grams per day, according to the Institute of Medicine.
The recommended daily value for fiber is 25 grams of fiber per day. Of course, this is one nutrient for which more (from whole foods) is better. No need to slam back fiber-supplement drinks to get more. Instead, boost your intake by making simple trades that, at the end of the day, really add up.